Abstract
Bioactive glasses are required that have a thermal expansion coefficient (TEC) matched to that of titanium for enamelled coatings. Wollastonite (CaSiO3) glass has low TEC but cannot be used as a coating for metallic implants. An attempt has been made to incorporate wollastonite (W) glass with multi-component phospho-silicate (PS) glass to reduce its TEC and to match it to that of titanium. Different volume fractions of W glass were mixed with a PS to study the effect of this glass on the properties of glass alloys. The TECs of glass alloys produced did not reduce with W volume fraction as expected on a simple rule of mixtures model, but the TEC was determined by the PS glass matrix. The glass transition temperature and softening point of the PS glass increased probably as a result of alkali metals diffusing from the PS glass to W glass.
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